Guard or shield for glass-drawing apparatus.



W. WESTBURY.

GUARD 0R SHIELD FOR GLASS DRAWING APPARATUS.

APPLICATION FILED JAN. 26, 1916.

L fifim-o Patented May 8, 1917.

wiaweooco nnrrnn snares PATENT opinion.

'W'KLLIA'QE WESTBURY, OF OKMULGEE, QKLAHOMA, ASSIGNOR T0 L. S. SKELTON, 0F QKMULGEE. OKLAHOMA.

QUARD 03R, SHIELD FOR GLASS-DRAWING APPARATUS.

Application filed January 26, 1916.

To all whom it may concern:

Be it known that I, VVILLTAM l/Vns'rnUnY, a citizen of the United States, residing at Okmulgee, in the county of O'kmulgee and State of Oklahoma, have invented new and useful Improvements in Guards or Shields for Glass-Drawing Apparatus, of which the following is a specification.

This invention relates to a guard or shield for glass drawing apparatus, designed to be used above the drawing ring for the purpose of guarding or shielding the drawing ring, surface of the body of glass in the glass receptacle and the cylinder which is being drawn from the chilling effects of the atmosphere.

Guards or shields of this character are commonly made in one piece of fire-clay and usually provided with a water jacket for protecting the same from the heat. and it is found that. in the use of such shields the cylinder and parts of the drawing apparatus are often unduly cooled, resulting in the objectionable hardening of the glass composing the cylinder and chilling of the glass in the drawing ring and doghouse or other glass receptacle. Furthermore, as these shields are subject to high degrees of expansion and contraction, they are liable to break or become warped and useless for further service, rendering it necessary to discard the entire shield at some considerable expense.

One object of the invention is to provide a guard or shield of composite construction and including bricks or sections of fire clay or other fire roof material capable of being interchangea ly connected, whereby in the event of injury to or disintegration of any of the sections of the shield another may be readily and conveniently substituted in its place.

A further object of the invention is to provide a guard or shield which is simple of construction, inexpensive of production, and of maximum eliiciency in use, and which includes a head ring or portion having dovetailed projections for engagement with dove-tailed portions of fire brick sections forming the body of the shield and which are adapted to be engaged and disengaged with and from each other and with and from said dove-tailed projections by relative lateral movements, and to permit ready and free expansion and contraction of the Specification of Letters Patent.

Patented May 8, 1191?.

Serial No, 74,469.

shield, whereby a shield of maximum durability will be produced.

lhe invention consists of the features of (ZODStIlHtlOIl, combination and arrangement oi parts hereinafter fully described and claimed, reference being had to the accompanying drawing in which Figure l is a sectional view through a glass receptacle, drawing ring and guard or shield constructed in accordance with my nvention, and showing said guard or shield in operative position.

Fig. 2 is a fragmentary view in elevation of the shield on an enlarged scale.

Fig. 3 is a transverse section through the Fig. t is a perspective view of one of the bricks or sections thereof.

Referring to the drawing, 1 designates the guard or shield which is normally ar ranged for operation within the drawing opening 2 of a doghouse or other glass receptacle 3, and is arranged to rest upon the top of the drawing ring at, which floats upon the surface'of the glass within said receptacle. As is well known, shields of this kind are suitably supported for vertical movementand are employed to give a wide range of protection to the body of hot glass Within the receptacle, the drawing ring and the base of the cylinder which is being formed to prevent the same from being too rapidly coohul or chilled to an undue extent.

The ring 1 is constructed in accordance with my invention of a head ring or suspending ring 5 which is preferably made of cast iron and in two semi-circular sections which are suitably united at diametrically opposite points, as illustrated, for example, at (5. This ring is provided with suitable means. as eyes 7, for the attachment to suitable hoisting cables or other raising and lowering elements, and by constructing said head ring in sections it is better adapted to expand and contract without fracture or distortion, as will be readily understood.

The ring 5 is provided with a continuous series of depending projections 8 of wedgeshape formation and providing dove-tailed recesses or openings 5) to receive Wedge shaped or dove-tailed projections 10 upon a series of bricks or blocks 11 made of fire clay or other fire proof material. These bricks or blocks are of proper depth and thickness to form the ring-shaped body of the shield which is subjected to the heat of the contents of the glass receptacle and drawing ring. As these bricks or blocks are composed of fire-proof material and thus form a sectional body, the sections of which are adapted to freely expand and contract, it will be evident that a durable type of shield will be produced which will maintain its shape and at the same time protect the body of glass, drawing ring and cylinder to much better advantage.

The fire-proof bricks or sections 11 are adapted to be inserted and removed by sliding them into and outof position in a direction laterally of the shield, and they are provided at their side edges with reverse pro ections or flanges 12 to form lap-joints, by which the spaces between the same will be sufliciently closed while permitting the bricks to have a certain degree of relative movement both laterally and circumferentially of the shield to compensate for expansion and contraction with a minimum degree of liability of fracture. The con struction disclosed. however, adapts the bricks to be interchangeably used so that in the event of the cracking or disintegration of a brick from any cause it may be removed and another substituted in its place, so that the shield may be kept intact and in good working condition at a comparatively low expense. Inasmuch as the bricks are arranged closer to the source of heat and protect the head ring and projections to a large extent therefrom, it will be evident that the head portion of the ring will also be of a durable character.

By making the supporting or head ring in sections and the body of the ring in sections, instead of constructing each of a solid piece, the shield as a whole as well as the component parts thereof are permitted to expand and contract with much less liability of fracture or warping, while being rendered capable of standing a higher degree of heat. 1*urthermore, this construction of shield prevents any sudden variations of temperature about the cylinder which is being drawn, thus keeping the wall of the cylinder softer and enabling it to be better drawn than is possible with the use of ordinary shields which are subject to variations of temperature, thus causing the glass at the base of.the cylinder to harden to an objectionable degree.

I claim 1. A shield of the character described comprising a sectional supporting ring, and an annular series of fire proof bricks disposed beneath the ring, said bricks being provided with lapping portions and detachably connected with the ring;

2. A shield of the character described comprising a sectional supporting ring ha"- ing depending supportig projections, and an annular series of fire-proof bricks disposed beneath said ring, said bricks having lapping engagement with each other and detachable interlocking engagement with said projections.

3. A shield of the character described comprising a sectional supporting ring having depending, spaced dovetailed projections, and an annular series of fire-proof bricks having flanges for lapping engagement with each other, said bricks being provided with dove-tailed projections, said projections forming dove-tailed recesses between the bricks, for detachable interlock"- ing engagement with the dove-tailed projections of the ring.

4..A shield of the character described comprising a sectional supporting ring having depending spaced dove-tailed supporting lugs, and fire-proof bricks having lapping portions and provided with dove-tailed projections for lateral interlocking engagement with said lugs.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM IVESTBURY.

Witnesses:

A. L. NIXON, J. T. PANCOAST. 

